A labor union representing health care workers, school employees and janitors endorsed state Rep. Pete Gallego in a Democratic primary race for a congressional district stretching from San Antonio to West Texas.

Gallego, D-Alpine, received the Service Employees International Union endorsement, one week after the Texas AFL-CIO issued a dual endorsement for Gallego and former Rep. Ciro Rodriguez, D-San Antonio.

Gallego, Rodriguez and San Antonio patent lawyer John Bustamante sought the SEIU endorsement and will square off in the May 29 Democratic Primary.